CN117584088A

CN117584088A - Electric tool

Info

Publication number: CN117584088A
Application number: CN202310602493.5A
Authority: CN
Inventors: 李菊; 黄存荣
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2022-08-11
Filing date: 2023-05-25
Publication date: 2024-02-23
Also published as: CN117584089A; WO2024032318A1; CN117584087A; CN117595418A

Abstract

The application discloses power tool includes: a motor; a housing configured to at least partially enclose the motor; the first energy storage device is used for supplying power to the motor and comprises at least one first energy storage unit; the electric tool further comprises a second energy storage device, the second energy storage device comprises at least one capacitive battery, a switching circuit is arranged between the second energy storage device and the motor, and when the voltage of the first energy storage device is lower than that of the second energy storage device, the switching circuit is switched on so that the second energy storage device supplies power for the motor. Therefore, when the voltage of the first energy storage device cannot provide power for the motor, the second energy storage device can be connected to supply power for the motor, and the power supply of the motor is timely supplied, so that continuous operation of the electric tool is guaranteed.

Description

Electric tool

Technical Field

The application relates to the technical field of electric tools, in particular to an electric tool.

Background

With the development of battery technology, power tools are gradually replacing engine tools. In order to provide a cordless power tool with a better use effect, a battery pack is also required to have a higher output characteristic. For example, the rated power and capacity of the battery pack are also required to be larger and larger in order to achieve a working effect and a endurance time similar to those of the engine operation. And as the types of power tools are diversified, it is required that the battery pack is capable of supporting the operation of the power tools at a lower temperature.

When the electric tool in the related art is used, the electric energy supply to the motor cannot be timely supplemented, so that the electric tool cannot adapt to abrupt changes of working conditions, and a discontinuous phenomenon occurs in operation.

Disclosure of Invention

The application provides an electric tool to solve the electric tool and can not adapt to the mutation of operating mode, lead to the problem of discontinuous phenomenon appearing in the operation.

To solve the above problems, an embodiment of a first aspect of the present application provides an electric tool, including: a motor; a housing configured to at least partially enclose the motor; a first energy storage device for powering the motor, the first energy storage device comprising at least one first energy storage unit; the electric tool further comprises a second energy storage device, the second energy storage device comprises at least one capacitor battery, a switch circuit is arranged between the second energy storage device and the motor, and when the voltage of the first energy storage device is lower than that of the second energy storage device, the switch circuit is switched on so that the second energy storage device supplies power for the motor.

In one embodiment, the first energy storage device is removably mounted to the housing, the first energy storage device further configured to be removable from the housing to power another power tool.

In one embodiment, the switching circuit includes a diode.

In one embodiment, the switching circuit further comprises a synchronous rectifier.

In one embodiment, the switching circuit comprises a field effect transistor.

In one embodiment, the electric tool further comprises a controller, wherein the controller is used for detecting voltages at two ends of the field effect tube and controlling on-off of the field effect tube.

In one embodiment, in the switch circuit, the PCB copper foil width is greater than or equal to 1.5cm.

In one embodiment, in the switching circuit, the PCB copper foil is windowed.

To solve the above problem, an embodiment of a second aspect of the present application provides a power tool, including: a motor; a housing configured to at least partially enclose the motor; a controller configured to control rotation of the motor; a first energy storage device for powering the motor, the first energy storage device comprising at least one first energy storage unit; the electric tool further comprises a second energy storage device, the second energy storage device comprises at least one capacitor battery, a switch circuit is arranged between the second energy storage device and the motor, and the controller controls the switch circuit to be switched on according to at least one working parameter so that the second energy storage device supplies power for the motor.

In one embodiment, the operating parameter is a SoC.

In one embodiment, the operating parameter is SoH.

To solve the above problem, an embodiment of a third aspect of the present application provides a power tool, including: a motor; a housing configured to at least partially enclose the motor; a battery pack interface disposed in the housing, the battery pack interface configured to be capable of being coupled to a first energy storage device and a second energy storage device, respectively, the first energy storage device being capable of powering the motor when coupled to the battery pack interface, the second energy storage device being capable of powering the motor when coupled to the battery pack interface; wherein a discharge rate of at least one of the first energy storage device and the second energy storage device is 10C or more and 50C or less.

In one embodiment, the first energy storage device comprises a first energy storage unit and the second energy storage device comprises a second energy storage unit.

In one embodiment, the second energy storage unit is a capacitive battery.

In one embodiment, the shape of the battery pack interface matches the shape of the first energy storage device charging interface and the shape of the second energy storage device charging interface.

To solve the above problem, a fourth aspect of the present application provides a power tool, including: a motor; a housing configured to at least partially enclose the motor; the power supply assembly comprises a first energy storage device and a second energy storage device, and is used for supplying power to the motor; wherein a discharge rate of at least one of the first energy storage device and the second energy storage device is 10C or more and 50C or less.

In one embodiment, the second energy storage device comprises a capacitive battery.

In one embodiment, the motor further comprises a discharge unit comprising a first discharge switch, the first energy storage device powering the motor when the first discharge switch is on; the discharge unit further comprises a second discharge switch, and when the second discharge switch is turned on, the second energy storage device supplies power to the motor.

In one embodiment, the power tool is an impact type power tool.

In one embodiment, the first discharge switch is turned on when the power tool is in a steady state; when the electric tool is in a high-current working condition, the first discharging switch and the second discharging switch are simultaneously turned on.

In one embodiment, the stable operating condition is: when the electric tool works under the stable working condition, the discharge multiplying power of at least one of the first energy storage device and the second energy storage device is smaller than or equal to 30C; when the electric tool works under the high-current working condition, the discharge multiplying power of at least one of the first energy storage device and the second energy storage device is larger than 30C.

According to the embodiment of the application, the electric tool comprises: a motor; a housing configured to at least partially enclose the motor; the first energy storage device is used for supplying power to the motor and comprises at least one first energy storage unit; the electric tool further comprises a second energy storage device, the second energy storage device comprises at least one capacitive battery, a switching circuit is arranged between the second energy storage device and the motor, and when the voltage of the first energy storage device is lower than that of the second energy storage device, the switching circuit is switched on so that the second energy storage device supplies power for the motor. Therefore, when the voltage of the first energy storage device cannot provide power for the motor, the second energy storage device can be connected to supply power for the motor, and the power supply of the motor is timely supplied, so that continuous operation of the electric tool is guaranteed.

It should be understood that the description of this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an electric tool according to an embodiment of the present application;

fig. 2 is a schematic structural view of a battery pack mounting part in the electric tool according to an embodiment of the present application;

FIG. 3 is a schematic view of a power tool according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of a power tool according to one embodiment of the present application;

FIG. 5 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 6 is a block schematic diagram of a power tool according to another embodiment of the present application;

FIG. 7 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 8 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 9 is a block schematic diagram of a power tool according to another embodiment of the present application;

FIG. 10 is a flowchart of a control method of the electric tool according to the embodiment of the present application;

FIG. 11 is a block schematic diagram of an electronic assembly according to an embodiment of the present application;

FIG. 12 is a block schematic diagram of an electronic assembly according to one embodiment of the present application;

FIG. 13 is a block schematic diagram of an electronic assembly according to another embodiment of the present application;

FIG. 14 is a block schematic diagram of an electronic assembly according to yet another embodiment of the present application;

FIG. 15 is a block schematic diagram of an electronic assembly according to another embodiment of the present application;

FIG. 16 is a block schematic diagram of an electronic assembly according to yet another embodiment of the present application;

fig. 17 is a schematic structural view of a charger in an electronic combination according to still another embodiment of the present application;

FIG. 18 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 19 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 20 is a block schematic diagram of a power tool according to another embodiment of the present application;

FIG. 21 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 22 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 23 is a block schematic diagram of a power tool according to another embodiment of the present application;

FIG. 24 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 25 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 26 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 27 is a block schematic diagram of a power tool according to another embodiment of the present application;

FIG. 28 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 29 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 30 is a block schematic diagram of a power tool according to another embodiment of the present application;

FIG. 31 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 32 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

FIG. 33 is a block schematic diagram of a power tool according to another embodiment of the present application;

FIG. 34 is a block schematic diagram of a power tool according to yet another embodiment of the present application;

Fig. 35 is a flowchart of a method for preheating an electric tool according to an embodiment of the present application.

Detailed Description

In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

The battery pack of the existing adaptive electric tool often needs a charging time of several hours, so that in the process of using the electric tool by a user, if the electric quantity of the battery pack is exhausted, the battery pack needs to be detached from the electric tool, and after the battery pack is charged for a long time, the battery pack is assembled to the electric tool again, and then the electric tool can be used continuously, and inconvenience is brought to the user.

In embodiments of the present application, the power tool system may include various types of power tools, such as hand-held power tools, garden power tools, smart power tools, and the like. In one embodiment, the power tools in the tool system may be powered using at least one energy storage device, a so-called battery pack, capable of storing and discharging electrical energy. The power tool may be powered by a battery pack built into the tool, by a battery pack removably mounted to the power tool, or by both.

The electric tool is provided with a housing or a mounting portion for mounting a battery pack built in the electric tool or a battery pack detachably mounted on the electric tool.

In one embodiment, when the power tool 100 has two energy storage devices, as shown in fig. 1, the housing 102 is formed with a first mounting portion 1181 and a second mounting portion 1182, the first mounting portion 1181 is used for mounting the first energy storage device 103, the first energy storage device 103 is configured to supply power to the motor 101, and the first energy storage device 103 includes at least one first energy storage unit 1031. The second mounting portion 1182 is configured to mount a second energy storage device 104, where the second energy storage device 104 is configured to supply power to the motor 101, and the second energy storage device 104 includes at least one second energy storage unit 1041. In this embodiment, the power tool may operate when both energy storage devices are powered or when only one energy storage device is powered.

In one embodiment, the first energy storage device 103 may be fixedly mounted on the first mounting portion 1181 or detachably mounted on the first mounting portion 1181, and the second energy storage device 104 may be fixedly mounted on the second mounting portion 1182 or detachably mounted on the second mounting portion 1182.

In one embodiment, the power tool may include at least one battery pack interface having one end for connecting to a battery pack and/or removable battery pack built into the power tool and the other end for connecting to an external energy storage device to cause the external energy storage device to power the battery pack and/or removable battery pack built into the power tool. Or one end of the battery pack interface is connected with the motor, and the other end of the battery pack interface is connected with an external energy storage device, so that the external energy storage device supplies power for the motor. Optionally, the shape of the battery pack interface 112 needs to match the shape of the charging interface of the first energy storage device 103 and the shape of the charging interface of the second energy storage device 104.

In one embodiment, as shown in fig. 1, when there are two battery pack interfaces, a first battery pack interface 1033 may be provided in the first mounting portion 1181, and the first battery pack interface 1033 includes a first positive terminal 1034, a first negative terminal 1035, and a first communication terminal 1036. A second battery pack interface 1043 may be provided in the second mounting portion 1182, and the second battery pack interface 1043 includes a second positive terminal 1044, a second negative terminal 1045, and a second communication terminal 1046.

The battery pack interface may be one, as shown in fig. 2, and when the battery pack interface is one, the battery pack interface may be provided with a first positive terminal 1034, a first negative terminal 1035, a first communication terminal, a second positive terminal 1044, a second negative terminal 1045, and a second communication terminal. The first positive terminal 1034, the first negative terminal 1035, and the first communication terminal are coupled to the first energy storage device 103, and the second positive terminal 1044, the second negative terminal 1045, and the second communication terminal are coupled to the second energy storage device 104. Optionally, the first positive terminal 1034, the first negative terminal 1035, the second positive terminal 1044, and the second negative terminal 1045 are located at four corner points of the rectangle, and the common communication terminal 300 is located at a center point of the rectangle. Alternatively, the first positive electrode terminal 1034, the first negative electrode terminal 1035, the common communication terminal 300, the second negative electrode terminal 1045, and the second positive electrode terminal 1044 are arranged in this order.

In one embodiment, as shown in fig. 2, when the battery pack interface is one, the first communication terminal and the second communication terminal may be shared as one communication terminal 300. That is, the battery pack interface includes the first positive electrode terminal 1034, the first negative electrode terminal 1035, the second positive electrode terminal 1044, the second negative electrode terminal 1045, and the common communication terminal 300 when one battery pack interface is provided. It will be appreciated that when the power tool 100 is compatible with the first energy storage device 103 and the second energy storage device 104, a battery pack interface 112 may be provided, and a first positive terminal 1034 and a first negative terminal 1035 for connecting the first energy storage device 103, and a second positive terminal 1044 and a second negative terminal 1045 for connecting the second energy storage device 104 may be provided at the battery pack interface 112. And a common communication terminal 300 in communication with the external energy storage device, the first energy storage device 103 and the second energy storage device 104 may share the communication terminal. Thereby, space can be saved, and an opening to the casing 102 can be saved.

In the above example, the first positive electrode terminal 1034, the second positive electrode terminal 1044, the first negative electrode terminal 1035, and the second negative electrode terminal 1045 are all retractable. So as to avoid the terminals from being exposed outside when not in use and short circuit between the terminals.

In the above example, the first positive terminal 1034 or the second positive terminal 1044 can withstand a current of 100A or more. The second positive electrode terminal 1044 can withstand a current of 100A or more for a duration of 5 seconds at most. The second negative terminal 1045 can withstand a current greater than or equal to 100A. Thus, the need for a subsequent fast charge mode is met by using a capacitive battery.

Optionally, the first positive terminal and the second positive terminal have a width ratio greater than 2.

Optionally, the first negative terminal and the second negative terminal have a width ratio greater than 2.

Optionally, the first positive terminal 1034, the first negative terminal 1035, the first communication terminal, the second positive terminal 1044, the second negative terminal 1045, and the second communication terminal in the above examples may be telescopic, so as to avoid damage or short circuit caused by the exposed terminals outside the electric tool 100.

How the battery pack interface is connected with the external energy storage device, how the external energy storage device charges the first energy storage device and the second energy storage device through the battery pack interface is described in the following, and related description is not given here.

In one embodiment, a void-free terminal may also be provided on the battery pack interface for the external energy storage devices of different numbers of terminals to match the battery pack interface when connected to the external energy storage device.

In one embodiment, the first energy storage unit may be a ternary lithium battery or a lithium iron phosphate battery or a capacitive battery, and the second energy storage unit may be a capacitive battery. In one embodiment, the first energy storage device and the second energy storage device may simultaneously power different modules in the power tool. For example, the first energy storage device may provide primary power to the motor and the second energy storage device may provide secondary power to a control module or other functional modules in the tool, such as an internet of things module or a lighting module. In one embodiment, the first energy storage device may power the power tool and may charge the second energy storage device; the second energy storage device may also charge the first energy storage device when supplying power to the electric tool, and a charging and discharging manner between the two energy storage devices will be described later, which will not be described in detail herein.

In one embodiment, the energy storage device used to power the power tool may be a capacitive battery. Referring to the tool system 10 shown in fig. 3, the tool system 10 may include a capacitive battery 1091 and a power tool 100, wherein the power tool 100 may be a blower 100a, a lawnmower 100b, a chainsaw 100c, a riding mower 100d, or an electric drill 100e. In a different tool system, the capacitive battery 1091 may be removably mounted to the mounting portion 118 of the power tool or may be secured to the mounting portion 118. In the present embodiment, a grass cutting machine is taken as an example of a power tool, and other types of power tools are not listed.

In one embodiment, when the power tool 100 has an energy storage device, the power tool 100 shown with reference to fig. 4 and 5 includes:

a motor 101;

a housing 102 configured to at least partially enclose the motor 101, the housing 102 being formed with a mounting portion 118;

the power tool 100 further includes a capacitive battery 1091, the capacitive battery 1091 being mounted to the mounting portion 118.

The capacitor battery 1091 can discharge at a high rate, and has the advantages of low cost, long endurance time, high safety, long service life, quick charging, small occupation, and easy detection of the battery SOC, so that the capacitor battery 1091 supplies power to the electric tool 100 to improve the performance of the electric tool 100.

In one embodiment, the capacitive battery 1091 may include a plurality of capacitive cells, which may be cylindrical, with a length of the cells of less than or equal to 70mm, and a diameter of the cells of greater than or equal to 50mm and less than or equal to 200mm.

In one embodiment, the shape of the mounting portion 118 may exactly match the shape of the capacitive battery 1091 to mount the capacitive battery 1091.

Optionally, as shown in fig. 4, the casing 102 is further formed with a handle 120, the handle 120 is held by a user, and the mounting portion 118 may be disposed on the handle 120.

In one embodiment, the mounting portion 118 may be provided on the handle 120 of the power tool 100, thereby saving space on the body of the power tool 100.

Alternatively, the housing 102 includes two opposing halves, and the mounting portion 118 is formed on at least one of the two opposing halves.

In one embodiment, the mounting portion 118 may be provided on the housing 102, and if the mounting portion 118 is cylindrical, one half of the cylinder may be provided on one half of the housing, and the other half of the cylinder may be provided on the other half of the housing, such that when the housings are brought together, the two half cylinders may form a cylindrical mounting portion. In other embodiments, a cylindrical mounting portion 118 may be provided on one half of the housing 102.

Optionally, as shown in fig. 6, the electric tool 100 further includes an internet of things module 107 electrically connected to the capacitive battery 1091, and the capacitive battery 1091 supplies power to the internet of things module 107.

Optionally, as shown in fig. 6, the lighting device 108 is further electrically connected to the capacitor 1091, and the capacitor 1091 supplies power to the lighting device 108.

The internet of things module 107 is disposed in the electric tool 100, so that communication between the electric tool 100 and other terminals, such as a computer terminal, a mobile phone terminal, other electric tools or battery packs or adapters, can be realized, and thus other terminals can monitor performance parameters of an energy storage device in the electric tool 100. The illumination device 108 may be turned on when illumination is required for operation of the power tool 100. The lighting device 108 may be turned on, for example, during night time or when operating in an environment with poor vision.

In one embodiment, as shown in fig. 5-7, a built-in energy storage device 1091 located in the power tool 100 may power the motor 101, or the motor 101 may be powered by connecting an external energy storage device through the battery pack interface 112, or both, or the built-in energy storage device 109 may be powered by connecting an external energy storage device through the battery pack interface 112.

Therefore, the capacitor battery is arranged to supply power to the electric tool, so that the power supply device of the electric tool has the advantages of larger discharge multiplying power, lower cost, longer endurance time and the like.

In one embodiment, as shown in fig. 8, a controller 106 and a charging circuit 105 are further added to the power tool 100 including the first energy storage device 103 and the second energy storage device 104. The controller 106 and the charging circuit 105 are used for charging the first energy storage device 103 to the second energy storage device 104 or for charging the second energy storage device 104 to the first energy storage device 103.

It can be appreciated that the first energy storage device 103 is detachably mounted on the casing 102, and when the motor of the electric tool 100 needs to be powered, the first energy storage device 103 can supply power to the electric tool 100; when the electric tool 100 does not need to use electricity, the first energy storage device 103 can be detached to be installed on other electric tools to supply power to the other electric tools so as to realize multi-machine use of one battery; or when the motor of the electric tool 100 needs to use electricity and the electric quantity of the first energy storage device 103 is low, the first energy storage device 103 can be detached and replaced by a new first energy storage device. In addition, the first energy storage device 103 may also charge the second energy storage device 104 when the second energy storage device 104 needs to be charged, and the second energy storage device 104 is charged under the condition that the charging is satisfied.

In another embodiment, the second energy storage device 104 is detachably mounted on the casing 102, and the second energy storage device 104 can supply power to the electric tool 100 when the electric tool 100 needs to use power for motor operation; when the electric tool 100 does not need to use electricity, the second energy storage device 104 can be detached to be installed on other electric tools to supply power to the other electric tools so as to realize multi-machine use of one battery; or when the motor of the electric tool 100 needs to use electricity and the second energy storage device 104 has low electric quantity, the second energy storage device 104 can be detached and replaced by a new second energy storage device 104. In addition, the second energy storage device 104 may also charge the first energy storage device 103 when the first energy storage device 103 needs to be charged, and the second energy storage device itself may charge the first energy storage device 103 under the condition of satisfying the charging.

The first energy storage device 103 and the second energy storage device 104 are devices that can store electric energy in advance. Thus, the inconvenience of connecting the power supply through the pull cord when the user works with the electric tool 100 is avoided. And the electric tool 100 can be re-operated by replacing the first energy storage device 103 or recharging the first energy storage device 103, which is greatly convenient for users.

In one embodiment, the charging circuit 15 may include a power switch element (switch tube), and when the controller 106 determines that the second energy storage device 104 needs to be charged, the controller may control the power switch element in the charging circuit 15 to be turned on, so that the first energy storage device 103 charges the second energy storage device 104. One energy storage device within the power tool 100 charges another energy storage device, reducing the set up of the charging interface. When the controller 106 determines that the second energy storage device 104 does not need to be charged, the charging circuit 15 may be controlled to be turned off to cut off the circuit between the first energy storage device 103 and the second energy storage device 104.

Specifically, how to determine that the second energy storage device 104 needs not to be charged is obtained by the following method, as shown in fig. 10, the control method includes:

s101, detecting the residual electric quantity of the first energy storage device 103 and the second energy storage device 104;

s102, controlling the first energy storage device 103 to charge the second energy storage device 104 according to the residual electric quantity of the first energy storage device 103 and the second energy storage device 104.

Optionally, controlling the first energy storage device 103 to charge the second energy storage device 104 according to the remaining power of the first energy storage device 103 and the second energy storage device 104 includes:

When the remaining power of the first energy storage device 103 is greater than or equal to the first preset power, and the remaining power of the second energy storage device 104 is less than or equal to the second preset power, the first energy storage device 103 is controlled to charge the second energy storage device 104.

It may be appreciated that, when the first energy storage device 103 and the second energy storage device 104 can jointly supply power to the motor 101, the controller 106 may detect the remaining electric power of the first energy storage device 103 and the second energy storage device 104 in real time, and when the remaining electric power of the first energy storage device 103 is greater than or equal to the first preset electric power, and the remaining electric power of the second energy storage device 104 is less than or equal to the second preset electric power, control the first energy storage device 103 to charge the second energy storage device 104. The first preset power may be 1/3 of the total power of the first energy storage device 103, and the second preset power may be 1/10 of the total power of the second energy storage device 104. That is, the controller 106 may control the first energy storage device 103 to charge the second energy storage device 104 when the first energy storage device 103 satisfies the self-electricity amount and the second energy storage device 104 needs to be charged. Thus, the provision of external charging terminals to the second energy storage device 104 is reduced. The first energy storage device 103 charges the second energy storage device 104 more conveniently and rapidly.

In the above example, detecting the remaining power may be detected by the battery power manager.

In one embodiment, the first energy storage device 103 and the second energy storage device 104 may separately supply power to the electric tool, or may supply power to the tool at the same time. For example, the first energy storage device 103 and the second energy storage device 104 may jointly supply power to the power tool 100 when the power tool 100 requires a high power output or a high torque output.

Optionally, as shown in fig. 9, the electric tool 100 further includes an internet of things module 107 electrically connected to the second energy storage device 104, and the second energy storage device 104 supplies power to the internet of things module 107. The power tool 100 further includes a lighting device 108 electrically connected to the second energy storage device 104, the second energy storage device 104 providing power to the lighting device 108.

In the above example, the capacity ratio of the second energy storage device 104 to the first energy storage device 103 is 1 or less.

In one embodiment, as shown in fig. 11, the energy storage device 109 is charged by an external charger 200 on the basis that the power tool 100 has the energy storage device 109. Alternatively, when the external energy storage device is connected to the energy storage device 109 with the battery pack interface 112 to supply power to the energy storage device 109 with the battery pack interface, the energy storage device 109 includes contact terminals exposed to the surface of the casing 102, and the charging interface 201 includes terminals matched with the contact terminals, on the basis that there are two energy storage devices, but only one charging interface of the energy storage device is reserved, and the other energy storage device is internally charged by the energy storage device. Alternatively, the energy storage device 109 is closely attached to the housing 102, and the charging interface 201 includes a wireless charging coil. Alternatively, the power tool 100 further includes a battery pack coupling for detachably mounting a battery pack capable of charging the energy storage device 109.

That is, the charged energy storage device 109 may power the motor 101 of the power tool 100 and may be located in the power tool 100. In summary, the external energy storage device can charge the energy storage device 109 in three charging modes. As shown in fig. 12, the first method is: by providing a contact terminal at the charging interface 201 and also providing a contact terminal on the energy storage device 109, the charger 200 can charge the energy storage device 109 when the charging interface 201 contacts the terminal on the energy storage device 109, which can reduce the contact failure during charging. As shown in fig. 13, the second method is: by providing a wireless charging coil in the charging interface 201, the energy storage device 109 is charged by wireless charging, which may reduce the arrangement of wires. The third way is: a detachable battery pack is provided in the power tool 100, and the energy storage device 109 is charged by the battery pack, so that the charging is more convenient. Therefore, the energy storage device 109 is charged by three modes of the contact terminal, the wireless charging coil and the battery pack, so that the energy storage device 109 can be timely supplemented when electric quantity is needed.

Optionally, the charger 200 charges the energy storage device 109 with a charging rate greater than or equal to 5C and less than 50C.

In one embodiment, as shown in fig. 14 and 15, the power tool 100 includes a first energy storage device 103 and a second energy storage device 104, and when both of the energy storage devices are charged by the charger 200, the charger 200 includes an identification unit 206, a control unit 207, and a charging mode setting unit 202. It will be appreciated that the charger 200 also includes a charging interface 201.

It should be noted that the first energy storage device 103 and the second energy storage device 104 may be located in the electric tool 100, where the first communication terminal 1036 in the first battery pack interface 1033 of the first energy storage device 103 may communicate with the communication terminal 205 in the charging interface 201, and further, the identification unit 206 may identify that the communication terminal 205 communicates with the first communication terminal 1036, and the control unit 207 controls the charger 200 to charge the first energy storage device 103 according to the information identified by the identification unit 206. Similarly, the second communication terminal 1046 of the second battery pack interface 1043 of the second energy storage device 104 may communicate with the communication terminal 205 of the charging interface 201, and further, the identification unit 206 may identify that the communication terminal 205 communicates with the second communication terminal 1046, and the control unit 207 controls the charger 200 to charge the second energy storage device 104 according to the information identified by the identification unit 206. When the charger 200 charges the first energy storage device 103, the positive terminal 203 in the charging interface 201 may be electrically connected to the first positive terminal 1034, and the negative terminal 204 is electrically connected to the first negative terminal 1035 to charge the first energy storage device 103. When the charger 200 charges the second energy storage device 104, the positive terminal 203 in the charging interface 201 may be electrically connected to the second positive terminal 1044, and the negative terminal 204 is electrically connected to the second negative terminal 1045 to charge the second energy storage device 104.

In one embodiment, charging interface 201 is one, but may include two sets of positive and negative terminals, and may be telescopic.

That is, the charging interface 201 may include a first charging positive terminal, a first charging negative terminal, a second charging positive terminal, and a second charging negative terminal, so configured that different energy storage device types may be matched. When the charger 200 charges the first energy storage device 103, the first charging positive terminal in the charging interface 201 may be electrically connected with the first positive terminal 1034, and the first charging negative terminal is electrically connected with the first negative terminal 1035 to charge the first energy storage device 103. When the charger 200 charges the second energy storage device 104, the second charging positive terminal in the charging interface 201 may be electrically connected to the second positive terminal 1044, and the second charging negative terminal is electrically connected to the second negative terminal 1045 to charge the second energy storage device 104. Wherein, the two sets of positive and negative terminals are telescopic, that is, when the charging interface 201 is coupled to the first battery pack interface 1033, the first set of positive and negative terminals extend, the second set of positive and negative terminals shrink, and when the charging interface 201 is coupled to the second battery pack interface 1043, the second set of positive and negative terminals extend, and the first set of positive and negative terminals shrink. The positive and negative terminals are prevented from being exposed, and short circuit is avoided between the terminals.

In one embodiment, each set of positive and negative terminals in charging interface 201 may be provided in one charging interface, based on charging interface 201 including two sets of positive and negative terminals. That is, as shown in fig. 16, a first set of positive and negative terminals is provided in the first charging interface 2011, and a second set of positive and negative terminals is provided in the second charging interface 2012. The first charging interface 2011 can be coupled with the first interface 1033; a second charging interface 2012 can be coupled with a second interface 1043. The coupling modes can comprise three modes of a contact terminal, a wireless charging coil and a battery pack.

The charger 200 further comprises a control unit 207, the control unit 207 is electrically connected to the first charging interface 2011, the second charging interface 2012 and the charging mode setting unit 202, respectively, and when the first charging interface 2011 is coupled to the first energy storage device 103, the control unit 207 controls the charger 200 to charge the first energy storage device 103 in the normal charging mode; when the second charging interface 2012 is coupled to the second energy storage device 104, the control unit 207 controls the charger 200 to charge the second energy storage device 104 according to the charging mode set by the charging mode setting unit.

It can be appreciated that when coupled with contact terminals, as shown in fig. 17, the charger 200 includes a first charging interface 2011 and a second charging interface 2012, wherein the first charging interface 2011 includes a first charging positive terminal 20111, a first charging negative terminal 20112, and a first charging communication terminal 20113; the second charging interface 2012 includes a second charging positive terminal 20121, a second charging negative terminal 20122, and a second charging communication terminal 20123.

A first positive terminal, a first negative terminal, a first communication terminal may be included in the first battery pack interface 1033 of the first energy storage device 103, and a second positive terminal, a second negative terminal, a second communication terminal may be included in the second battery pack interface 1043 of the second energy storage device 104. Thus, when the first communication terminal communicates with the first charging communication terminal, the first charging interface 2011 is coupled to the first interface 1033, such that the first charging positive terminal is electrically connected to the first positive terminal, the first charging negative terminal is electrically connected to the first negative terminal, and the charger 200 is configured to charge the first energy storage device 103; when the second communication terminal communicates with the second charging communication terminal, the second charging port 2012 is coupled to the second interface 1043, such that the second charging positive terminal is electrically connected to the second positive terminal, the second charging negative terminal is electrically connected to the second negative terminal, and the charger 200 is configured to charge the second energy storage device 104. Two charging interfaces are arranged on the charger 200, so that the first energy storage device 103 and the second energy storage device 104 can be charged simultaneously under certain conditions, and the arrangement of two groups of terminals can be suitable for different types of energy storage device terminals.

Wherein, each communication terminal can be a communication device such as Bluetooth, wiFi, radio frequency and the like.

It will be appreciated that when the charger 200 charges the first energy storage device 103 (a ternary lithium battery or a lithium iron phosphate battery), the first energy storage device 103 is charged in a normal charging mode. When the charger 200 charges the second energy storage device 104 (capacitive battery), the first energy storage device 103 is charged in the normal charging mode or the quick charging mode. The charge mode may be set by the charge mode setting unit 202.

The charging magnification in the normal charging mode is less than 5C. The charge rate of the fast charge mode is greater than or equal to 5C and less than 50C, C being a unit of charge-discharge rate. The battery can be charged within 20 minutes by the charging rate of more than 5C, and the charging distribution line for the battery is low in power consumption and low in heat generation, and the heat dissipation plate is not required.

In one embodiment, when an energy storage device in a power tool is charged by a battery pack, the battery pack includes: a housing; a power tool interface for connection with the power tool, the power tool interface comprising a terminal assembly; a plurality of battery cells accommodated in the housing, the plurality of battery cells being connected in a combined serial-parallel configuration, the plurality of battery cells being electrically connected with the terminal assembly; the plurality of battery cells are capacitive batteries; and the charging control unit is used for controlling the charging of the plurality of battery core units.

It should be noted that, be provided with a plurality of electric core units in the battery package, a plurality of electric core units are the electric capacity battery, from this, when the battery package was for electric tool power supply or for first energy storage device or second energy storage device charge, charge rate is fast, long service life.

In one embodiment, when the power tool 100 includes the first energy storage device 103 and the second energy storage device 104, the second energy storage device 104 supplies power to the motor 101 under certain conditions. As shown in fig. 18, a switch circuit 111 is provided between the second energy storage device 104 and the motor 101, and when the voltage of the first energy storage device 103 is lower than that of the second energy storage device 104, the switch circuit 111 is turned on to cause the second energy storage device 104 to supply power to the motor 101.

The switching circuit 111 includes a diode.

Normally, when the motor 101 of the electric tool 100 is operated, the first energy storage device 103 is powered, and when the voltage of the first energy storage device 103 is lower than the voltage of the second energy storage device 104, the switch circuit 111 is turned on.

It should be noted that, the voltage supplied to the motor 101 by the first energy storage device 103 may be obtained through a power supply line of the motor 101, the voltage at one end of the switch circuit 111 is the voltage supplied to the motor 101 by the first energy storage device 103, the voltage at the other end is the voltage of the second energy storage device 104, and when the voltage at one end of the switch circuit 111 connected to the motor 101 is lower than the voltage of the second energy storage device 104, the switch circuit 111 is turned on, so that the second energy storage device 104 supplies power to the motor 101. For example, the switch circuit 111 may be a diode, a cathode of the diode is connected to the motor 101, and an anode of the diode is connected to the second energy storage device 104. When the voltage difference across the diode changes, the diode turns on. Wherein the voltage difference between the highest voltage of the first energy storage device 103 and the voltage of the second energy storage device 104 is smaller than the breakdown voltage of the diode itself.

The switching circuit 111 further includes a synchronous rectifier.

The grid of the synchronous rectifying tube is connected with the second energy storage device 104, the drain electrode is connected with the motor 101, and when the voltage between the grid and the drain electrode is positive, the synchronous rectifying tube is conducted, so that the second energy storage device 104 supplies power to the motor 101.

The switching circuit 111 includes a field effect transistor. As shown in fig. 19, when the switch circuit 111 includes a fet, the power tool 100 further includes a controller 106, and the controller 106 is configured to detect a voltage across the fet and control on/off of the fet.

The voltage across the fet is detected by the controller 106, and when the voltage of the first energy storage device 103 is lower than the voltage of the second energy storage device 104, the switch circuit 111 is controlled to be turned on, so that the second energy storage device 104 supplies power to the motor 101. Conversely, when the voltage of the first energy storage device 103 is higher than the voltage of the second energy storage device 104, the control switch circuit 111 is turned off to cut off the power supplied from the second energy storage device 104 to the motor 101.

In the above example, in the switch circuit 111, the PCB copper foil width is greater than or equal to 1.5cm. In the switch circuit 111, the PCB copper foil is windowed. Furthermore, the over-current capability of the copper foil is increased by increasing the thickness of the copper foil of the PCB or by windowing the copper foil of the PCB, so as to adapt to the situation that the discharge loop current of the second energy storage device 104 is larger.

Thus, in this embodiment, when the voltage of the first energy storage device 103 is insufficient, the second energy storage device 104 is turned on in time to supply power to the motor 101, so that the motor 101 can continuously operate during operation, and the operation interruption caused by the low voltage of the motor 101 is avoided.

In one embodiment, as shown in fig. 20, on the basis of setting the switch circuit 111 in the electric tool 100, in addition to monitoring the voltage parameters of the first energy storage device 103 and the second energy storage device 104, the controller 106 may detect the operation parameters of the first energy storage device 103 to control the on or off of the switch circuit 111.

Alternatively, the operating parameter may be SoC (state of charge/remaining charge). Alternatively, the operating parameter may be SoH (battery capacity, health, performance status).

It is appreciated that the controller 106 may detect the operating parameters of the first energy storage device 103, such as SoC and/or SoH, in real time. When the detected operation parameter is SoC, if the SoC parameter of the first energy storage device 103 is lower than the preset threshold, the controller 106 controls the switch circuit 111 to be turned on, so that the second energy storage device 104 can supply power to the motor 101 through the switch circuit 111. If the SoC parameter of the first energy storage device 103 is higher than the preset threshold, the controller 106 may control the switch circuit 111 to be turned off, so that the second energy storage device 104 stops supplying power to the motor 101. The switching circuit 111 may be a switching transistor (triode or MOS transistor).

When the detected operation parameter is SoH, if the SoH parameter of the first energy storage device 103 is lower than the set threshold, which indicates that the performance of the first energy storage device 103 is reduced, the controller 106 may control the switch circuit 111 to be turned on, so that the second energy storage device 104 may supply power to the motor 101 through the switch circuit 111. If the SoH parameter of the first energy storage device 103 is higher than the set threshold, the controller 106 may control the switch circuit 111 to be turned off, so that the second energy storage device 104 stops supplying power to the motor 101.

When the detected operation parameters are SoC and SoH, if any one of the SoH parameter and the SoC parameter of the first energy storage device 103 is lower than the threshold value, the controller 106 may control the switch circuit 111 to be turned on, so that the second energy storage device 104 may supply power to the motor 101 through the switch circuit 111. Conversely, the controller 106 may control the switching circuit 111 to turn off such that the second energy storage device 104 stops supplying power to the motor 101. When the controller 106 detects that the working parameters of the first energy storage device 103 are multiple, the first energy storage device 103 can be detected in multiple aspects, so that the defect of the first energy storage device 103 can be detected timely, and the switch circuit 111 is opened timely, so that the second energy storage device 104 supplies power to the motor 101, the power supply to the motor 101 is supplemented timely, and continuous operation of the motor 101 is guaranteed.

The above embodiment illustrates that the second energy storage device 104 supplies power to the motor 101 under certain conditions. In another embodiment, other ways of controlling the first energy storage device 103 and/or the second energy storage device 104 to supply power to the motor 101 may also be selected.

As shown in fig. 21 and 22, the first energy storage device 103 and the second energy storage device 104 may be collectively referred to as a power supply assembly 113, and the power supply assembly 113 may supply power to the motor 101, that is, the first energy storage device 103 and/or the second energy storage device 104 may supply power to the motor 101. For example, when the first energy storage device 103 supplies power to the motor 101, the second energy storage device 104 is idle; alternatively, when the second energy storage device 104 supplies power to the motor 101, the first energy storage device 103 is idle; alternatively, the first energy storage device 103 and the second energy storage device 104 simultaneously power the motor 101. In the above power supply example, the discharge rate of at least one of the first energy storage device 103 and the second energy storage device 104 is greater than or equal to 10C and less than or equal to 50C, so as to ensure that the whole discharge circuit is protected from being burned by a large current on the basis that the motor 101 can work normally.

Optionally, as shown in fig. 22, the motor 101 is powered by the first energy storage device 103 when the first discharge switch 115 is turned on, and the discharge unit 114 further includes a discharge unit 114, where the discharge unit 114 includes the first discharge switch 115; the discharge unit 114 further comprises a second discharge switch 116, the second energy storage device 104 powering the motor 101 when the second discharge switch 116 is turned on.

Alternatively, when the power tool 100 is in a steady state condition, the first discharge switch 115 is turned on; when the power tool 100 is in a high current condition, the first discharge switch 115 and the second discharge switch 116 are simultaneously turned on.

In one embodiment, the discharge rate of the at least one energy storage device is less than or equal to 30C when the tool is operating in a steady state; when the tool works under a high-current working condition, the discharge multiplying power of at least one energy storage device is larger than 30 ℃.

In one embodiment, the first discharging switch 115 and the second discharging switch 116 may be externally provided as buttons, and are triggered according to the user requirement, wherein when the first discharging switch 115 is turned on, for example, a first gear operating condition, when the second discharging switch 116 is turned on, for example, a second gear operating condition, and when both the first discharging switch 115 and the second discharging switch 116 are turned on, for example, a third gear operating condition, each gear operating condition is different. Thus, by the arrangement of the discharge unit 114, the first energy storage device 103 and/or the second energy storage device 104 may be controlled autonomously to supply power to the motor 101 directly according to the needs of the user.

The first discharge switch 115 and the second discharge switch 116 may each be a mechanical switch.

Therefore, when the voltage of the first energy storage device cannot provide power for the motor, the second energy storage device can be connected to supply power for the motor, and the power supply of the motor is timely supplied, or the motor is triggered by a user, or the corresponding energy storage device is triggered according to different working conditions to supply power for the motor 101, so that continuous operation of the electric tool is guaranteed.

In one embodiment, as shown in fig. 23, the first energy storage device 103 is detachably mounted on the electric tool 100, the first energy storage device 103 is connected to the first control module 121, the first control module 121 is used for detecting the electric quantity of the first energy storage device 103 and sending the electric quantity to the second control module 122, the second control module 122 is connected to the second energy storage device 104 and is used for detecting the electric quantity of the second energy storage device 104, when the electric tool 100 is in a stable working condition, the first discharging switch 115 is turned on, the first energy storage device 103 supplies power to the motor 101 through the first discharging switch 115, and when the electric tool 100 is in an instantaneous high-current working condition, the second control module 122 controls the second discharging switch 116 to be turned on, and the first energy storage device 103 and the second energy storage device 104 supply power to the motor 101 simultaneously. And when the second control module 122 detects that the second energy storage device 104 has low electric quantity, and the first control module 121 detects that the electric quantity of the first energy storage device 103 meets the charging requirement, the charging circuit 105 can be controlled to be turned on, so that the first energy storage device 103 charges the second energy storage device 104.

In one embodiment, as shown in fig. 24, the second energy storage device 104 may also power the internet of things module 107 and/or the lighting device 108 through the second discharge switch 116.

In one embodiment, as shown in fig. 25 and 26, if only one energy storage device is used to supply power to the motor 101, the first control module 121 may detect the electric quantity of the energy storage device, and the second control module 122 may control the opening or closing of the discharge switch according to the electric quantity of the energy storage device, so as to supply power to the motor 101 or cut off power.

In one embodiment, the first energy storage device 103 may be a lithium battery pack and the second energy storage device 104 may be a capacitive battery pack. The electric tool can be compatible with a lithium battery pack and a capacitor battery pack to obtain electric energy.

In one embodiment, as shown in fig. 27, on the basis that the electric tool 100 includes the first energy storage device 103 and the second energy storage device 104, a temperature detecting device 117 and a controller 106 are further added, where the temperature detecting device 117 is configured to detect the temperature of the first energy storage device 103 and send the detected temperature to the controller 106; the temperature detection means 117 is arranged within the first energy storage means 103. That is, the temperature sensor may be directly within the first energy storage device 103.

In one embodiment, as shown in fig. 28, the housing 102 is formed with a mounting portion 118, the first energy storage device 103 is mounted to the mounting portion 118, and the temperature detecting device 117 is provided at the mounting portion 118. Thereby, the mounting of the first energy storage device 103 and the temperature detection device 117 by the mounting portion 118 is more concentrated, and the temperature detection device 117 can better detect the temperature of the first energy storage device 103.

The controller 106 is configured to control the second energy storage device 104 to preheat the first energy storage device 103 when the temperature of the first energy storage device 103 is less than or equal to a first preset temperature and greater than or equal to a second preset temperature.

It will be appreciated that the first energy storage device 103 provides power to the motor 101, but the energy storage device typically has a suitable operating temperature range, and the discharge efficiency of the energy storage device becomes low when the energy storage device is in a low temperature environment, i.e. below a suitable operating temperature. Thus, it is necessary to ensure the operating temperature of the first energy storage device 103.

The temperature detecting device 117 detects the temperature of the first energy storage device 103, and the controller 106 may control the second energy storage device 104 to preheat the first energy storage device 103 when the temperature of the first energy storage device 103 is between the second preset temperature and the first preset temperature. When the temperature is higher than the first preset temperature, the second energy storage device 104 may stop preheating the first energy storage device 103. Wherein the second preset temperature is-40 ℃. The first preset temperature is-20 ℃. Therefore, when the electric tool 100 is used in a low temperature environment, the second energy storage device 104 preheats the first energy storage device 103, so as to avoid the influence of the discharge performance of the first energy storage device 103 in the low temperature environment, and ensure the normal operation of the motor 101.

The temperature detecting means 117 in the above example process may be a temperature sensor.

In one embodiment, the preheating mode is mainly that the controller 106 controls the second energy storage device 104 to preheat the first energy storage device 103, and the second energy storage device 103 discharges a load adjacent to the first energy storage device 103.

It is understood that the load may be a resistor, a heating wire, etc., and the resistor or the heating wire is discharged through the second energy storage device 103, so as to heat the resistor or the heating wire, and the load is adjacent to the first energy storage device 103, so that the heat of the resistor heated, or the heat of the heating wire heated, may be transferred to the first energy storage device 103, so as to preheat the first energy storage device 103.

In one embodiment, the preheating is mainly performed by physically connecting the second energy storage device 104 with the first energy storage device 103 through a heat conducting material.

The heat conducting material may be metal with good heat conducting performance, such as copper, aluminum, etc., or may be other heat conducting materials, which is not limited in this application. The first energy storage device 103 and the second energy storage device 104 are physically connected through the heat conducting material, and when the two energy storage devices 104 discharge, the heat conducting material can be heated, so that heat is transferred to the first energy storage device 103 through the heat conducting material, and the first energy storage device 103 is preheated.

In one embodiment, the preheating is mainly performed by the second energy storage device 104 being adjacent to the first energy storage device 103.

In other embodiments, the second energy storage device 104 is adjacent to the first energy storage device 103, and the controller 106 may control the second energy storage device 104 to directly discharge the first energy storage device 103 to preheat the first energy storage device 103.

In order to save energy consumption and avoid that the temperature sensor is always in a detection state, as shown in fig. 29, the electric tool 100 further includes a power-on unit 119, the power-on unit 119 is configured to send a first signal to the controller 106, and when the controller 106 receives the first signal and the temperature of the first energy storage device 103 is less than or equal to a first preset temperature and greater than or equal to a second preset temperature, control the second energy storage device 104 to preheat the first energy storage device 103.

In one embodiment, the first signal is generated by the power-on unit 119 including an actuator, and the power-on unit 119 sends the first signal to the controller 106 when the actuator is operated to a predetermined position.

That is, the temperature detecting device 117 starts to detect the temperature of the first energy storing device 103 after the power tool 100 is turned on, and controls the second energy storing device 104 to preheat the first energy storing device 103 when the temperature of the first energy storing device 103 is less than or equal to the first preset temperature and greater than or equal to the second preset temperature. The temperature detection device 117 is prevented from always detecting the temperature of the first energy storage device 103, and the second energy storage device 104 always preheats the first energy storage device 103, so as to save energy consumption. The power-on unit 119 may include an actuator, which may be understood as a switch button of the power tool 100.

In one embodiment, the first signal is generated by the power tool 100 further including a wireless communication interface for communicatively coupling the power tool 100 to a remote device, and when the power-on unit 119 receives a standby signal sent by the remote device, the first signal is sent to the controller 106.

That is, the standby signal may be sent through the remote device, for example, when the user has not reached the construction site, the user may remotely operate the first energy storage device 103, and the user arrives at the construction site, and the first energy storage device 103 is already preheated and may be directly used, thereby saving time.

In one embodiment, as shown in fig. 30, in addition to the electric tool 100 including an energy storage device, a circuit board assembly 123 is further provided for driving the motor 101 to rotate; and a temperature detecting device 117 for detecting a temperature of at least one element of the circuit board assembly 123 and transmitting the detected temperature to the controller 106; the controller 106 is configured to control the energy storage device 109 to preheat at least one component of the circuit board assembly 123 when the temperature sent by the temperature detecting device 117 is less than or equal to the first preset temperature and greater than or equal to the second preset temperature.

It should be noted that, the circuit board assembly 123 may be understood as an assembly that converts the direct current output by the energy storage device 109 into an alternating current and supplies the alternating current to the motor 101, for example, may be an inverter. At low temperatures, some of the electronic components in the circuit board assembly 123 are less reliable, and therefore, the circuit board assembly 123 needs to be preheated prior to use of the power tool 100. Specifically, the temperature detecting device 117 detects the temperature of at least one element of the circuit board assembly 123, and when the temperature is less than or equal to the first preset temperature and greater than or equal to the second preset temperature, the energy storage device 109 may be controlled to preheat the circuit board assembly 123.

Specifically, there are three ways in which the energy storage device 109 may preheat the circuit board assembly 123, one way in which the energy storage device 109 may be adjacent to the circuit board assembly 123, and the heat may be transferred to the circuit board assembly 123 by self-heating the energy storage device 109. The other is that the circuit board assembly 123 and the energy storage device 109 are physically connected through the heat conducting material, the energy storage device 109 discharges and releases heat, and the heat is transferred to the circuit board assembly 123 through the heat conducting material, so that the heat transfer is fast. The resistor on the circuit board assembly 123 is directly discharged and heated to preheat the circuit board assembly 123, so that the circuit board assembly 123 has the characteristics of direct and rapid preheating. In practical application, one mode can be selected for preheating, or three modes can be set, but different preheating modes are selected according to different temperature intervals. Wherein, to reduce space, the controller 106 may be integrally disposed on the circuit board assembly 123. The circuit board assembly 123 includes low temperature resistant electronic components. The circuit board assembly 123 includes electronic components that are not resistant to low temperatures.

On the basis of the embodiment of fig. 30, a power-on unit 119 may also be provided to save power.

Optionally, as shown in fig. 31, the electric tool 100 further includes a second energy storage device 104, where the second energy storage device 104 supplies power to the motor 101, based on the embodiment of fig. 30. It can be appreciated that by providing the second energy storage device 104, the motor 101 can be powered in time when the energy storage device 109 is low, so that the motor 101 can continuously operate.

In one embodiment, the energy storage device may also provide preheating to the handle 120 of the power tool while the motor is powered. As shown in fig. 32, the temperature detecting device 117 is configured to detect the temperature of the handle 120 and send the detected temperature to the controller 106; when the temperature of the handle 120 is less than or equal to the first preset temperature and greater than or equal to the second preset temperature, the controller 106 controls the energy storage device 109 to preheat the handle 120. The energy storage device 109 is disposed in the handle 120, so as to be beneficial to directly preheating the handle 120 and reduce heat loss of a preheating path.

It will be appreciated that when the power tool 100 is in a low temperature environment, the user holds the power tool 100, and the user feel cold, so that the cold feeling of the user can be reduced by preheating the handle 120. The method for preheating the handle 120 by the energy storage device 109 may refer to the method for preheating the first energy storage device 103 and the circuit board assembly 123 in the foregoing two examples, which is not described herein again.

In one embodiment, as shown in fig. 33, the energy storage device 109 in the power tool 100 both powers the motor and preheats the handle 120 and the circuit board assembly 123 under certain conditions, and the second energy storage device 104 also preheats the energy storage device 109. And a temperature detecting device 117 for detecting an ambient temperature and transmitting the detected ambient temperature to the controller 106.

The controller 106 is configured to control the energy storage device 109 to preheat the circuit board assembly 123 or the handle 120 when the temperature sent by the temperature detecting device 117 is equal to or less than the first preset temperature and equal to or greater than the second preset temperature.

Optionally, the power tool 100 further includes: the second energy storage device 104, the second energy storage device 104 supplies power to the motor 101, and the controller 106 is configured to control the energy storage device 109 to preheat the second energy storage device 104 when the temperature sent by the temperature detecting device 117 is less than or equal to the first preset temperature and greater than or equal to the second preset temperature. To improve the performance of the power tool 100.

In an embodiment, the first energy storage device 103 and the second energy storage device 104 are coupled to the battery pack by detecting the ambient temperature, such that the battery pack 113 is coupled to the first energy storage device 103 through the battery pack interface 112 at the operating temperature of the first energy storage device 103, such that the battery pack 113 is coupled to the second energy storage device 104 through the battery pack interface 112 at the operating temperature of the second energy storage device 104.

In one embodiment, the operating temperature of the power tool 100 may be detected to couple the battery pack interface 112 with which energy storage device 103. When the battery pack interface 112 is coupled with the first energy storage device 103, the working temperature of the electric tool 100 is greater than or equal to a first preset temperature, and when the battery pack interface 112 is coupled with the second energy storage device 104, the working temperature of the electric tool 100 is greater than or equal to a second preset temperature, and the first preset temperature is greater than the second preset temperature.

Optionally, when the battery pack interface 112 is coupled with the second energy storage device 104, the operating temperature of the power tool 100 is greater than or equal to-40 ℃ and less than or equal to 85 ℃.

Optionally, when the battery pack interface 112 is coupled with the first energy storage device 103, the operating temperature of the power tool 100 is greater than or equal to-20 ℃ and less than or equal to 70 ℃.

It will be appreciated that the first energy storage device 103 and the second energy storage device 104 are different, for example, the first energy storage device 103 may be a ternary lithium battery or a lithium iron phosphate battery, the second energy storage device 104 may be a capacitor battery, and the optimal operating temperature ranges of the several batteries are different, and further, when the electric tool 100 operates in different temperature ranges, the power supply to the different energy storage devices may be selected so that the energy storage devices can all operate in the optimal operating temperature range. It should be noted that the temperature detection device 117 may detect the operating temperature of the electric tool 100, so as to control whether the battery pack interface 112 is coupled to the first energy storage device 103 or the second energy storage device 104.

In another embodiment, which energy storage device powers the motor 101 may be selected by detecting the temperature of the energy storage device itself. As shown in fig. 34, the electric power tool 100 includes: a controller 106 for controlling at least the power supply of the motor 101 by the power supply assembly 113;

a temperature detecting device 117 for detecting the temperature of the power supply assembly 113 and transmitting to the controller 106;

when the temperature of the power supply assembly 113 is less than or equal to the first preset temperature and greater than or equal to the second preset temperature, the controller 106 selects the second energy storage device 104 to supply power to the motor 101.

That is, the power supply assembly 113 may supply power to the motor 101, i.e. the first energy storage device 103 may be selected to supply power to the motor 101, or the second energy storage device 104 may be selected to supply power to the motor 101, and since the working temperature ranges of the two energy storage devices are different, when the temperature of the power supply assembly 113 is less than or equal to the first preset temperature and greater than or equal to the second preset temperature, it is indicated that the second energy storage device 104 is suitable to supply power to the motor 101, and then the second energy storage device 104 may be selected to supply power to the motor 101. It will be appreciated that a switching tube may be provided between the second energy storage device 104 and the power supply circuit of the motor 101, and the controller 106 controls the switching tube to be turned on and off so as to control whether the second energy storage device 104 supplies power to the motor 101.

In one embodiment, as shown in fig. 35, the step of detecting the ambient temperature may be performed first, and the step of determining whether the ambient temperature is less than the second preset temperature through step S202 is performed, if yes, the step of detecting the temperature of the first energy storage device through step S203 is performed, if no, the step of determining whether the temperature of the first energy storage device is less than the first preset temperature through step S204 is performed, if yes, the step of preheating the circuit board assembly through step S205 is performed, the step of preheating the first energy storage device is performed, and the step of detecting the temperature of the first energy storage device in real time is performed, and when the temperature of the first energy storage device is greater than the first preset temperature, the step of preheating is performed.

In summary, the electric tool according to the embodiment of the present application includes: a housing; a motor mounted to the housing, the housing at least partially housing the motor; the first energy storage device is used for supplying power to the motor and comprises at least one first energy storage unit; the controller is at least used for controlling the first energy storage device to supply power to the motor; the temperature detection device is used for detecting the temperature of the first energy storage device and sending the temperature to the controller; the electric tool further comprises a second energy storage device, the second energy storage device comprises at least one second energy storage unit, and when the temperature of the first energy storage device is smaller than or equal to a first preset temperature and larger than or equal to a second preset temperature, the controller controls the second energy storage device to preheat the first energy storage device. Therefore, when the electric tool works in a low-temperature environment, the second energy storage device can preheat the first energy storage device, so that the first energy storage device can preheat first in the low-temperature environment and then supply power to a motor of the electric tool, and the problem that the first energy storage device is insufficient in voltage and cannot normally supply power to the motor is avoided.

The above embodiments do not limit the scope of the application. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application are intended to be included within the scope of the present application.

Claims

1. A power tool, comprising:

a motor;

a housing configured to at least partially enclose the motor;

a first energy storage device for powering the motor, the first energy storage device comprising at least one first energy storage unit;

the electric tool further comprises a second energy storage device, the second energy storage device comprises at least one capacitor battery, a switch circuit is arranged between the second energy storage device and the motor, and when the voltage of the first energy storage device is lower than that of the second energy storage device, the switch circuit is switched on so that the second energy storage device supplies power for the motor.

2. The power tool of claim 1, wherein the first energy storage device is removably mounted to the housing, the first energy storage device further configured to be removable from the housing to power another power tool.

3. The power tool of claim 1, wherein the switching circuit comprises a diode.

4. The power tool of claim 1, wherein the switching circuit further comprises a synchronous rectifier.

5. The power tool of claim 1, wherein the switching circuit comprises a field effect transistor.

6. The power tool of claim 5, further comprising a controller for detecting a voltage across the fet and controlling the on/off of the fet.

7. The power tool of claim 1, wherein the PCB copper foil width in the switching circuit is greater than or equal to 1.5cm.

8. The power tool of claim 1, wherein the PCB copper foil is windowed in the switching circuit.

9. A power tool, comprising:

a motor;

a housing configured to at least partially enclose the motor;

a controller configured to control rotation of the motor;

the electric tool further comprises a second energy storage device, the second energy storage device comprises at least one capacitor battery, a switch circuit is arranged between the second energy storage device and the motor, and the controller controls the switch circuit to be switched on according to at least one working parameter so that the second energy storage device supplies power for the motor.

10. The power tool of claim 9, wherein the operating parameter is SoC.

11. The power tool of claim 9, wherein the operating parameter is SoH.

12. A power tool, comprising:

a motor;

a housing configured to at least partially enclose the motor;

a battery pack interface disposed in the housing, the battery pack interface configured to be capable of being coupled to a first energy storage device and a second energy storage device, respectively, the first energy storage device being capable of powering the motor when coupled to the battery pack interface, the second energy storage device being capable of powering the motor when coupled to the battery pack interface;

wherein a discharge rate of at least one of the first energy storage device and the second energy storage device is 10C or more and 50C or less.

13. The power tool of claim 12, wherein the first energy storage device comprises a first energy storage unit and the second energy storage device comprises a second energy storage unit.

14. The power tool of claim 13, wherein the second energy storage unit is a capacitive battery.

15. The power tool of claim 12, wherein the battery pack interface is shaped to match the shape of the first energy storage device charging interface and the shape of the second energy storage device charging interface.

16. A power tool, comprising:

a motor;

a housing configured to at least partially enclose the motor;

the power supply assembly comprises a first energy storage device and a second energy storage device, and is used for supplying power to the motor;

17. The power tool of claim 16, wherein the second energy storage device comprises a capacitive battery.

18. The power tool of claim 16, further comprising a discharge unit including a first discharge switch, the first energy storage device powering the motor when the first discharge switch is on; the discharge unit further comprises a second discharge switch, and when the second discharge switch is turned on, the second energy storage device supplies power to the motor.

19. The power tool of claim 16, wherein the power tool is an impact type power tool.

20. The power tool of claim 18, wherein the first discharge switch is turned on when the power tool is in a steady state condition; when the electric tool is in a high-current working condition, the first discharging switch and the second discharging switch are simultaneously turned on.

21. The power tool of claim 20, wherein a discharge rate of at least one of the first energy storage device and the second energy storage device is less than or equal to 30C when the power tool is operating in the steady state condition; when the electric tool works under the high-current working condition, the discharge multiplying power of at least one of the first energy storage device and the second energy storage device is larger than 30C.